So let me start with the rebate part of the question and then maybe we could talk a little bit about the new options. From a rebate standpoint, you shouldn't expect that the percentage will go up because volumes and revenue go up. Typically, what drives the rebate percentage up is really one of 2 things. One is you get into a particularly volatile period. In that volatility you tend to see more market makers move into the markets, which drives the rebate percentage higher. Unfortunately, for power, that hadn't been the case. We haven't seen a lot of volatility in those markets. The other time that you tend to see in the OTC market and really, the futures markets as well, the market maker percentages increase is when you're really trying to get new products launched, whether it's options or any sort of new product, you need to get market makers in those markets early making markets. So Jeff's point, if 2 months, 3 months, 8 months later, if only market makers, those markets don't survive. But in early days, if you want to get liquidity growing, you needed to go get those market makers in. And so what I think you're seeing a little bit is as we establish more new markets in OTC, particularly around option, we're trying to bring more market makers in to get the liquidity building. As that liquidity builds, it attracts commercials who may be trading a different product that's somewhat less correlated or slightly different. And then they start to see the depth of liquidity in the new product and decide, "Okay, the bid offer's tighten enough. The liquidity is deepen enough. I now want to move into those markets." So over time, I think you'll see that normalize. Over longer periods, the rebate percentage ought to stay relatively constant. But again, as we're developing new markets you do on occasion see it tick up a little bit more. With regards to options, as Jeff alluded to, that's been a key strategy for us over the past, really 3 years. And we bought Yellow Jacket back in 2009, and when we did that deal, we announced that the real driver behind it was we did not believe anyone in our space had come up with a great way of enabling trading for options electronically. As we sit here today, that's no longer the case. We've announced a number of new options products in power, in gas, in oil, on the futures side, on the OTC side and on the ag side. And all of that has been enabled by the investments that we've made in technology. So you do see an industry typically in less volatile, maybe lower liquidity times, trade a bit more on the option side. And again, I think that's what you're seeing in power right now. New products, better technology, maybe a little less volatile market. And that's helping the overall options volume on the power side.